fu·gac·i·ty /fjuˈgæsəti/
  易逃逸,不安定,無常
  fu·gac·i·ty /fjuˈgæsətɪ/ 名詞
  Fu·gac·i·ty a.
  1. The quality of being fugacious; fugaclousness; volatility; as, fugacity of spirits.
  2. Uncertainty; instability.
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  fugacity
       n 1: the tendency of a gas to expand or escape
       2: the lack of enduring qualities (used chiefly of plant parts)
          [syn: fugaciousness]